These new algorithms "Remove parts by length" and
"Remove parts by area" filter out parts of geometries from
a vector layer, by checking their area or length vs
a minimum size parameter.
If the input geometry is a multipart geometry, then the parts
will be filtered by their individual sizes. If no parts match the
required minimum size, then the feature will be skipped and
omitted from the output layer.
If the input geometry is a singlepart geometry, then the feature
will be skipped if the geometry's size is below the required size
and omitted from the output layer.
Attributes are not modified.
The existing concave hull algorithm is quite restrictive as it
forces operation on an entire layer, which makes it useless eg
to create concave hulls from service area outputs.
Rename the existing one to "concave hull (by layer)", and make
sure all the documentation explains this so its more predictable
for users.
Based on tickets/stackexchange posts/mailing list activity, this
seems to be a highly in demand tool which is fragile and error
prone when run via the SAGA Processing Plugin.
Port to a native tool to avoid this situation, and give a nice
optimised out-of-the-box tool.
Note that this is functionally a 1:1 clone of the SAGA tool. I've
verified that the outputs match SAGAs outputs, but any bugs
present in the SAGA implementation will also be present here.
This algorithm extracts point features corresponding to the minimum
and maximum pixel values contained within polygon zones.
The output will contain one point feature for the minimum and one
for the maximum raster value for every individual zonal feature
from a polygon layer.
This algorithm extracts extrema (minimum and maximum) values
from a given band of the raster layer.
The output is a vector layer containing point features for
the selected extrema, at the center of the associated pixel.
If multiple pixels in the raster share the minimum or maximum
value, then only one of these pixels will be included in the output.
The algorithm uses raster iterator to remain efficient on huge
rasters, and does not require reading the entire raster to
memory
The creategrid algorithm had a limit of 0 to 1000000000.0.
I'm removing this limitation to go beyond this maximum limit, but above all to
allow a negative limit, which in fact allows an empty space
(the opposite of superposition).
digital elevation model in order to classify pixels into ground
and non-ground cells
This is a port of the SAGA "DTM Filter (slope-based)" tool to a native
QGIS algorithm.
It also serves as a nice reference algorithm for raster based tools
which operate on a neighbourhood of pixels.
algorithm
If checked, then any disjoint parts in the buffer results will be
output as separate single-part features. This setting is designed
to expose a similar functionality as is available for the 'dissolve'
algorithm.
Sponsored by City of Canning
